1. The problem statement, all variables and given/known data How many Fe atoms and how many moles of Fe atoms are in 400.0 g of iron? 3. The attempt at a solution Ok. i attempted to find the number of moles by using 400/55.8 to get 7.17 but that is wrong?! please tell me ehy this is wrong. i set up a proportion like this 55.8g Fe = 1 mol all over 400.0 grams =x and i solved for that x. i know its wrong, but why?